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Fix some metric units truncating values too much

The metric units for nozzle erosion and burn rate coefficient were such that when reasonable values for these fields were displayed in them, the UI's 6 decimal digit limit meant that most if not all of the sig figs were truncated. If you then applied the changes, the value would be lost. This commit adds new metric units for these fields scaled similarly to the imperial units, hides or removes the bad units, and migrates preferences to the new ones.

Fix some metric units truncating values too much

The metric units for nozzle erosion and burn rate coefficient were such that when reasonable values for these fields were displayed in them, the UI's 6 decimal digit limit meant that most if not all of the sig figs were truncated. If you then applied the changes, the value would be lost. This commit adds new metric units for these fields scaled similarly to the imperial units, hides or removes the bad units, and migrates preferences to the new ones.

Remove tapered grain from todo in readme

Include version string and high res support in mac build file

Added warning for propellants with 0 range, moved spec files

Grain selector persists choices between sims if the number of grains …

…has not changed

Updated readme

Fixed refactor issue with alert dialog

Updated readme